<template>
  <view>
    <!-- 搜索 -->
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧滑动 -->
      <scroll-view class="lift-scroll-view" scroll-y="true" :style="{height: wh+'px'}">
        <block v-for="(cate,index) in cateList" :key="index">
          <view class="lift-scroll-view-item" :class="{active:active===index}" @click="activeChange(index)">{{cate.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧滑动 -->
      <scroll-view scroll-y="true" :style="{height: wh+'px'}" :scroll-top="scrollTop">
       <view class="cate-lv2" v-for="(item,index2) in cateLevel2" :key="index2">
         <view class="cate-lv2-title">
           /{{item.cat_name}}/
         </view>
         <view class="cate-lv3-list">
           <view class="cate-lv3-item" v-for="(it,i) in item.children" :key="i" @click="gotoGoodsList(it)">
             <image :src="it.cat_icon" mode=""></image>
             <text>{{it.cat_name}}</text>
           </view>
         </view>
       </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badge from '@/mixins/tabbar-badge.js'
  export default {
    mixins:[badge],
    data() {
      return {
        wh:0,
        cateList:[],
        active:0,
        cateLevel2:[],
        scrollTop:0
      };
    },
    onLoad() {
      const sysInfo=uni.getSystemInfoSync()
      this.wh=sysInfo.windowHeight-50
      this.getCateList()
    },
    methods:{
      // 获取左侧分类列表数据
      async getCateList(){
        const {data:res}=await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status!==200)return uni.$showMsg()
        this.cateList=res.message
        this.cateLevel2=res.message[0].children
      },
      activeChange(index){
        this.active=index
        this.cateLevel2=this.cateList[index].children
        this.scrollTop=this.scrollTop===0?1:0
      },
        // 编程式导航
      gotoGoodsList(it){
        uni.navigateTo({
          // url:'/subpkg/goods_list/goods_list?cid='+it.cat_id
          url:`/subpkg/goods_list/goods_list?cid=${it.cat_id}`
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
  .lift-scroll-view{
    width: 120px;
    .lift-scroll-view-item{
      background-color: #f7f7f7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      &.active{
        position: relative;
        background-color: #ffffff;
        &::before{
          content: '';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
    
  }
  
  .cate-lv2-title{
    font-size: 12px;
    font-weight:bold;
    text-align: center;
    padding: 15px 0;
  }
  .cate-lv3-list{
    display: flex;
    flex-wrap: wrap;
    .cate-lv3-item{
      margin-bottom: 10px;
      width: 33.33%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      image{
        width: 60px;
        height: 60px;
      }
      text{
        font-size: 12px;
      }
    }
  }
}
</style>
